The NSPCC has received more than 50 calls in the two hours after launching a dedicated hotline for sexual abuse victims.
Their new hotline comes after former footballers David White, Andy Woodward, Steve Walters and Paul Stewart came forward to claim they were allegedly abused by a former coach.
The Professional Footballers' Association said the number of players to have contacted them with similar stories has reached double figures.
NSPCC chief executive Peter Wanless said: "There must be no hiding place for sexual abuse in our national game and there may be many others who suffered through such horrors as young players but have never come forward."
The children's charity said boys are more than five times less likely to speak up about abuse than girls.
"As this week's revelations have laid bare, people must be able to speak out and get the help they need, and we know that can often be more difficult for men and boys."
- The hotline will be available 24 hours a day on 0800 023 2642.
Jamie Vardy said it has been "sickening" to learn of the details in football's child sex abuse scandal
Greg Clarke said that football, and other institutions, seemed to have a 'total unawareness' of the problem of child abuse in the 1990s.
The darts world champion was fiercely criticised for his 'offensive' and 'homophobic' comments about abuse victims.